Electronic winch monitoring system

Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum

Reexamination Certificate

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Details

C254S377000

Reexamination Certificate

active

11381122

ABSTRACT:
An electronic winch monitoring system for a winch having a fixed-ratio gearbox with input and output shafts, a winch drum connected to the output shaft, and an auxiliary brake connected to the output shaft activated by reducing the pressure in a brake release hydraulic circuit. The system comprises an input shaft speed sensor, an output shaft speed sensor, and an electronic control unit having a monitoring section and a brake control section. The monitoring section receives the speed signals, processes them to produce a calculated ratio of actual input to output shaft speeds, and produces a fault indication signal when the value of the difference between the calculated speed ratio and the fixed ratio exceeds a predetermined value. The brake control section, upon receiving the fault signal, reduces the hydraulic pressure in the brake circuit using a nonlinear pressure-time profile to engage the auxiliary brake and stop the winch drum.

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David Taylor, The great North Sea crane swap . . . , Business and Management Practices and Cranes Today, Apr. 2003, p. 42, ISSN: 0307-0018. Copyright 2003 Gale Group, Inc. and Copyright 2003 Wilmington Publishing Ltd., USA.

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